Try to improve caching?

.github/workflows/build.yml

@@ -10,11 +10,17 @@ jobs:
     runs-on: ubuntu-latest
     container:
       image: catthehacker/ubuntu:act-latest
+    env:
+      RUNNER_TOOL_CACHE: /toolcache
 
     steps:
       - name: Checkout code
         uses: actions/checkout@v2
 
+# Note to self: maybe look at this if we want to build outside docker?
+#      - name: Build with cache
+#        uses: Swatinem/rust-cache@v2
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v1
 
@@ -31,3 +37,5 @@ jobs:
           context: .
           push: true
           tags: git.joshuacoles.me/personal/monzo-ingestion:latest
+          cache-from: type=registry,ref=user/app:latest
+          cache-to: type=inline